The infrared spectra of amine collectors used in the flotation of iron ores
The infrared spectra of amine collectors used in the flotation of iron ores
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DOI：
10.1016/j.mineng.2004.10.016
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发表时间：
2005-02
影响因子：
4.8
通讯作者：
R. Lima;P. Brandão;A. Peres
中科院分区：
文献类型：
--
作者：
R. Lima;P. Brandão;A. Peres
反泡沫浮选是易达石铁矿最常用的选别方法，该方法浮选石英脉石，淀粉抑制氧化铁；中链乙胺乙酸酯是阳离子捕收剂。由于缺乏对这些试剂的红外光谱（以及其他类似技术）的深入研究，因此采用傅里叶变换红外光谱法对典型乙酸乙胺的红外光谱中的波段分配进行了研究。为了区分由阳离子胺离子和醋酸阴离子引起的条带，还研究了分子癸乙胺及其盐，经过乙酸或盐酸的一定程度的中和；此外，还包括醋酸钾，以单独评估阴离子带。通过这种方法，所有重要的能带都被成功地分配到收集器分子中的重要官能团上：NHx、CH2、CH3、- o -和乙酸带。在pH=10.5的乙酸癸乙胺水溶液中，在石英颗粒表面吸附后，证实了该方法的胺阳离子带的单独鉴定，而没有先前相关的醋酸带的存在。
Inverse froth flotation is the most used concentration method for itabiritic iron ores, where the quartz gangue is floated, and the iron oxides are kept depressed by starches; medium-chain etheramine acetates are the cationic collectors used. Since there is a lack of thorough studies on the infrared spectroscopy of these reagents (and by other similar techniques), an investigation on the band assignment in the infrared spectra of a typical etheramine acetate was carried out by Fourier-transform infrared spectrometry. To distinguish the bands due to the cationic amine ion from the acetate anion ones, a molecular decyletheramine was also studied, as well as its salts, after some degrees of neutralisation, by acetic or hydrochloric acids; also, potassium acetate was included, to assess the anion bands alone. From this approach, all the significant bands were successfully assigned to the important functional groups in the collector’s molecule: NHx, CH2, CH3, –O–, and the acetate bands. A confirmation of this method was the identification of the amine cation bands alone, without the presence of the previously associated acetate bands, after adsorption onto the surface of quartz particles, from an aqueous solution of a decyletheramine acetate, at pH=10.5.